[EKS] [Addon-feature]: StorageClass creation in EFS CSI Driver Addon

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**Tell us about your request**
An optional configration in EFS CSI Driver EKS Addon that will enable the StorageClass kind creation along with Addon installation , in the same as we have ENIConfig available as an optional configuration with VPC-CNI add-ons.

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Presently, the creation of StorageClass must be managed independently of the EFS CSI Driver EKS Addon. Consequently, one must utilize tools such as Terraform templates or Helm charts for this task, introducing additional management complexity to the associated code. Including optional configuration for StorageClass directly within the Addon would be advantageous, eliminating the need for separate management of templates or charts.

**Are you currently working around this issue?**
No

**Additional context**
The management and release of EKS Addons are handled by Amazon through the EKS service backend. While this feature request may not be directly relevant in this repo, upon reaching out to Amazon Premium Support, they advised us to submit a feature request here.

**Attachments**
If you think you might have additional information that you'd like to include via an attachment, please do - we'll take a look. (Remember to remove any personally-identifiable information.)

Start by reviewing the requested EFS CSI Driver EKS Addon behavior and the existing ENIConfig optional configuration for VPC-CNI add-ons. Confirm whether StorageClass creation belongs in this roadmap repository or requires an EKS service-backend change; done means the supported configuration and its scope are documented or implemented by the responsible team.

Written by the indexing model from the issue text.